Compare product margins using the same cost boundary

Two product margins are not comparable if they subtract different costs. Before ranking products, make the cost boundary and revenue basis consistent.

A high percentage can also produce fewer rupees than a lower percentage on a larger sale. Use the measure that answers the decision you are making.

Standardise the starting amount

Use realised revenue after discounts on a consistent accounting basis. Treat delivery income and tax consistently across the products.

Do not compare one product at list price with another at its usual discounted price.

If the business has several channels with different charges, keep channel-specific results visible rather than blending them without explanation.

Standardise the cost list

For each product, include the same categories where applicable: product or material cost, direct labour, packaging and relevant variable charges.

A cost can genuinely be zero or not applicable, but it should not be omitted merely because it is harder to estimate.

State what remains outside the comparison, such as fixed overhead. The resulting measure is then interpretable.

Compare rupees and percentages

In a hypothetical example, product A sells for ₹1,000 with defined variable costs of ₹600. Contribution is ₹400, or 40%.

Product B sells for ₹500 with costs of ₹250. Contribution is ₹250, or 50%.

B has the higher percentage, but A contributes more rupees per unit. Neither fact alone determines which product the business should prioritise.

Add the capacity question

Suppose A takes two hours of a constrained production step and B takes one. Under this simplified model, A contributes ₹200 per constrained hour and B contributes ₹250.

That comparison may matter if the same step is the bottleneck and demand exists for both.

Do not use the hourly result blindly. Different materials, uncertain demand or other constraints can change the decision.

Check demand and sell-through

A product with an attractive contribution does not help if it rarely sells or ties up stock for a long period.

Use observed sales where available, and distinguish confirmed orders from a forecast. Do not assume every available hour can be filled with the highest calculated contribution.

A balanced range may serve customer needs that a single-product optimisation misses.

Include order-level effects

Some products are often bought together. Shared packaging or delivery can change the basket contribution compared with isolated units.

Avoid allocating the full order cost to every item and then comparing inflated costs.

Choose a consistent allocation or analyse representative baskets directly. Explain which method is used.

Keep returns and defects comparable

If you include an allowance for one product, consider whether a comparable allowance is appropriate for the other. Use evidence or clearly labelled scenarios.

Do not penalise one item with observed adverse costs while assuming the other has none simply because its history is shorter.

Uncertainty should remain visible in the comparison.

Avoid using allocated overhead mechanically

A fixed cost allocation can be useful for some decisions, but it can also make a product appear unviable without showing whether removing it would remove that cost.

Separate contribution from allocated full-cost results. Ask what changes if the product is added or removed.

For consequential decisions, seek appropriate accounting or business advice rather than relying on one spreadsheet column.

Record a comparable period

Use the same dates when comparing realised performance. A seasonal launch week for one product and an ordinary month for another are not equivalent observations. Note stockouts too: low sales caused by unavailable stock should not automatically be interpreted as low customer interest in the product.

Make the ranking conditional

State the question: contribution per unit, contribution percentage, contribution per constrained hour or total expected contribution over a period.

Then show the relevant result and its assumptions. There is no single margin ranking that answers every business question.

Use the comparison to investigate pricing, process and range choices. The most useful sheet makes differences explainable instead of presenting unlike percentages as though they were a fair contest.

For the underlying percentage distinction, see markup and margin.